swarm: ctx propagation; bmt fixes; pss generic notification framework (#17150)

* cmd/swarm: minor cli flag text adjustments

* swarm/api/http: sticky footer for swarm landing page using flex

* swarm/api/http: sticky footer for error pages and fix for multiple choices

* cmd/swarm, swarm/storage, swarm: fix  mingw on windows test issues

* cmd/swarm: update description of swarm cmd

* swarm: added network ID test

* cmd/swarm: support for smoke tests on the production swarm cluster

* cmd/swarm/swarm-smoke: simplify cluster logic as per suggestion

* swarm: propagate ctx to internal apis (#754)

* swarm/metrics: collect disk measurements

* swarm/bmt: fix io.Writer interface

  * Write now tolerates arbitrary variable buffers
  * added variable buffer tests
  * Write loop and finalise optimisation
  * refactor / rename
  * add tests for empty input

* swarm/pss: (UPDATE) Generic notifications package (#744)

swarm/pss: Generic package for creating pss notification svcs

* swarm: Adding context to more functions

* swarm/api: change colour of landing page in templates

* swarm/api: change landing page to react to enter keypress

swarm/network/stream/intervals_test.go

@@ -117,8 +117,12 @@ func testIntervals(t *testing.T, live bool, history *Range, skipCheck bool) {
 
 	fileStore := storage.NewFileStore(sim.Stores[0], storage.NewFileStoreParams())
 	size := chunkCount * chunkSize
-	_, wait, err := fileStore.Store(io.LimitReader(crand.Reader, int64(size)), int64(size), false)
-	wait()
+	ctx := context.TODO()
+	_, wait, err := fileStore.Store(ctx, io.LimitReader(crand.Reader, int64(size)), int64(size), false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = wait(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}